linux-kernel - Re: [PATCH 0/5] hybrid union filesystem prototype

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Message-ID: <20100830183843.GB2444@shell>
Date:	Mon, 30 Aug 2010 14:38:43 -0400
From:	Valerie Aurora <vaurora@...hat.com>
To:	Neil Brown <neilb@...e.de>
Cc:	Miklos Szeredi <miklos@...redi.hu>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk,
	jblunck@...e.de, hch@...radead.org
Subject: Re: [PATCH 0/5] hybrid union filesystem prototype

On Fri, Aug 27, 2010 at 09:35:02PM +1000, Neil Brown wrote:
> On Fri, 27 Aug 2010 10:47:39 +0200
> Miklos Szeredi <miklos@...redi.hu> wrote:
> > > Changes to underlying filesystems
> > > ---------------------------------
> > > 
> > 
> > For now I refuse to even think about what happens in this case.
> > 
> > The easiest way out of this mess might simply be to enforce exclusive
> > modification to the underlying filesystems on a local level, same as
> > the union mount strategy.  For NFS and other remote filesystems we
> > either
> > 
> >  a) add some way to enforce it,
> >  b) live with the consequences if not enforced on the system level, or
> >  c) disallow them to be part of the union.
> > 
> 
> I actually think that your approach can work quite will with either the
> upper or lower changing independently.  Certainly it can produce some odd
> situations, but even NFS can do that (though maybe not quite so odd).

I'm very curious about your thoughts on how to handle the lower layer
changing.  Al Viro's comments:

http://lkml.indiana.edu/hypermail/linux/kernel/0802.0/0839.html

Do you see something we're missing?

-VAL
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